Horn or amplifier for phonographs



E. A. CAVINESS.

HORN 0R AMPLIHER FOR PHoNoGRAPHs.

APPLlCATlON vFILED NOV. 22, 1919.

Patented Apr. 11, 1922.

/71 l lll/[Irl] l x z O W v w ad M MK DOM UNl'prlsD STATES EDWIN A.oavnvnss, or BATTLEV'CREEKVMICHIGAN. Y

j HORN 0R AMPLIFIER FOR PHONOGRAPHS.

Specification orfiLetters Patent.

VPatented Apr. 11, 1922.

Application filed November 22, 1919. Serial No. 339,898.

tions being very largely eliminated.

Further objects, and objects relating to' structural details, willdefinitely appear Vfrom the detailed description to follow.

I accomplish the objects of my invention by the devices and meansdescribed in the following specification. vThe invention is clearlydefined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearlyillustrated in the accompanying drawing; forming a part of thisspecification, in W ch.

Fig. I is a vertical section from front to rear of a phonograph cabinethaving one of my improved horns installed therein, the horn being shownin full lines.

Fig. II is a cross section through the bell portion of my improved hornon a line 2 2 of Fig. I. i f V Fig. III is a similar section through aslightly modiiied embodiment of my invention, the top glass lining panelbeing omitted.

Fig. IV is an enlarged detail section on a line corresponding to linei-4t of Fig. I, showing 'structural details.

Fig. V is an enlarged detail section on a line corresponding to line 5 5of Fig. I, showing structural details.

Fig. VI is an enlarged cross section through the tube or neck of thehorn on a line corresponding'to line 6-6 of F ig. I.

Fig. VII is an enlarged detail section on a line corresponding to line 77 of Fig. VI. I

Referring to the drawing, 1 represents the body of a cabinet phonograph.As the details of the cabinet and reproducing mechanism proper form nopart of my present invention, they are not illustrated or describedherein.

My improved horn or amplifier comprises a curved yneck portion 2 and aflaring bell portion 3. Both the neck and bell portions are, in thestructure illustrated, rectangular in cross section. The walls of theneck portion are formed of multiply veneer, there being seven plies inthe structure illustrated. The veneer plies 4 are coated with a hard gumsuch as shella'c represented at 5, and the coated surfaces are glued toether as represented at 6 in Fig. VII.V o attempt is made to showthethickness of the veneer and the coating of the surfaces in relativeproportions in this ligure, although it is desirable to have the coatingof shellac or similar gum of substantial thickness. This forms a veryrigid neck portion of the instrument and one in whichl sympathetic soundvibrations are substantially eliminated. j

The bell yportion 2 comprises the outer walls 7 of wood glued togetherto form a rigid joint between them, and the inner panels 8 and 9 ofglass. substantially coextensive with the inner surfaces of the wallsand are secured thereto by clips 10. Packing strips 11V are arranged`between the edges of the `top and bottom walls 9 and the side walls 8.In Fig. III the top lining 8 is omitted. n

My improved horn produces tones of very clear bell-like quality. inwhich, as stated,

These panels are substantially all tones caused by sympa-V Atheticvibrations are eliminated.

' I have illustrated and described my iniprovements in an embodimentwhich I find to be very practical and satisfactory. I have not attemptedto illustrate or describe various modifications which might be desirableto adapt ymy improvements to different styles of cabinet or instrumentas I believe the disclosure made will enable those skilled in the art towhich my invention relates to embody or adapt the same as may bedeslred.

Having thus described my invention, what claim as new and desire tosecure by Let ters Patent is: j.

1'. A horn comprising a bell portion having outer rigidly united wallsof wood, and linings therefor of `glass panels substantiallyYcoeXItensive with the walls and held against the same by clips theinterior surfaces ofk en geging the ends of Said panels, there being In.Witness whereof, have hereunto set packing strips between the adjacentportions my hand und seal in the 'presence olf two in of. sail panels.Witnesses.

2. horn com )risino a bell )orl'ion hzw- 1 x t ing ontei rigidlyluniteWalls olf Wood1 and IJDvWIN A' LVINES' linings therefor of glass panelsSubstantially VitnesSes; eoextensive with the interior surfaces of theLUELLA G. GREENFIELD, Walls. MARGARET L. GLASGOW.

